30 Howard.—On a Disease of Tradescantia. 
conidiophore. In many cases these abjunctors were seen 
between the conidia and conidiophores, and in such cases the 
conidia rapidly became free (Fig 6). 
In several instances a conidiophore fell into the film of 
water on the surface of the cover-slip, and at once ceased 
to form spores, the tip growing into an ordinary sterile hypha. 
Later, the tip grew down into the air, and again gave rise to 
branchlets and conidia, thus bearing out Klebs’s observation 1 
that conidia can only develop in relatively dry air. and are 
converted into ordinary hyphae if too wet. 
After spore-formation had ceased, many of the sterile 
hyphae had brownish-yellow bodies, with rounded edges, 
attached to their surfaces (Fig. 14). These had the appearance 
of proteid crystals, but may have been mineral matters 
deposited from the concentrated and altered drop. 
On the eleventh day it was found that the hyphae in the 
hanging-drops commenced to knot up in a remarkable 
manner, and on the twelfth day it was found that the hyphal 
contents commenced to aggregate in certain parts of the 
mycelium, leaving the rest empty (Fig. 7). This went on 
until finally thick-walled circular chlamydospore-like bodies 
containing granular protoplasm were found which afterwards 
showed budding (Fig. 8). 
Cultures were next made with a food-material consisting 
of raisin-extract and gelatine. Vegetative growth was much 
more rapid and luxuriant than before, while the formation 
of conidiophores was delayed, especially on plate-cultures. 
After spore-formation had ceased chlamydospores were 
formed in a similar manner to that noted above (Figs. 8 and 9). 
The Fungus was then grown by infecting sterilized blocks 
of the sap-wood of oak with spores from a pure culture. 
In the first instance an abundant feathery white mycelium 
was formed, and in seven days long white conidiophores made 
their appearance, and these speedily covered the wood. 
The Fungus proved to be a species of Botryosporium , as 
1 Klebs, Die Eedingungen der Fortpflanzung bei einigen Algen und Pilzen, 
p. 452. 
